Interlocking building block



FIG. 1 is a perspective view of an interlocking building block showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a top view thereof.

FIG. 5 is a side view thereof;

FIG. 6 is a perspective view of a modified form of the block shown in FIG. 1;

FIG. 7 is a perspective view of another modified form of the block shown in FIG. 1;

FIG. 8 is a perspective view of another modified form of the block shown in FIG. 1; and

FIG. 9 is a perspective view of another modified form of the block shown in FIG. 1. 

The ornamental design for an interlocking building block, as shown and decided. 